Yes, you can use a calculator on the GRE. An on-screen calculator is available for every single Quant question across both sections. You do not need to request it. It appears in the test interface automatically.
What it can do is limited. What it cannot do matters more than most test-takers realize going in.
What the Calculator Can Do
The GRE provides a standard 4-function calculator with a square root button. Specifically:
- Addition
- Subtraction
- Multiplication
- Division
- Square roots
- Memory functions (M+, M-, MR, MC)
- Parentheses for order of operations
- A "Transfer Display" button (covered below)
The display shows up to 8 digits. That is more than enough for most GRE calculations, but it matters when you are dealing with very large numbers in multiplication or division.
The Transfer Display Button
The Transfer Display button is specific to Numeric Entry (NE) questions, the question type where you type your answer directly into a box with no multiple choice options to select from.
When you finish a calculation on the calculator, pressing Transfer Display sends the number currently showing on the calculator screen directly into the answer box. This eliminates manual transcription and the typo risk that comes with it. On Numeric Entry questions where the answer is a decimal (say, 4.375), use the calculator, confirm the result, then Transfer Display instead of typing it manually.
What the Calculator Cannot Do
This is the more important list.
No exponents. If you need to compute 2^8, the calculator will not do it for you. You have to either work it out by hand (2, 4, 8, 16, 32, 64, 128, 256) or know the result from memory.
No logarithms. The GRE does not test logarithms, so this is not a practical gap. You will not encounter a problem where you need log₂(256).
No trigonometry. Also not tested on the GRE. No sine, cosine, tangent.
No nested parentheses beyond basic grouping. The parentheses work, but the calculator does not handle complex nested expressions the way a scientific calculator would. Keep your expressions simple. Break them into steps.
8-digit display limit. For most problems, this is irrelevant. If you run into a scenario involving very large numbers (a compound interest problem with a large principal, for example), be aware that the display will not show numbers beyond 8 digits. Work in smaller units or simplify before calculating.
No formula memory. The calculator does not store formulas. You need to know the area of a circle, the Pythagorean theorem, the percent change formula. None of that is in the calculator. It is in your head or nowhere.
When to Use the Calculator
The calculator is genuinely useful in a specific set of situations. Here is the short list.
Long division with non-clean numbers. If a problem produces something like 847 ÷ 23, use the calculator. Working that out by hand under time pressure introduces error and eats time. Let the machine do it.
Multi-digit multiplication. 347 × 58 is the kind of calculation where manual arithmetic under pressure produces mistakes. Type it in.
Non-perfect square roots. √2, √3, √5, √7 are irrational numbers. The GRE sometimes requires you to compare or estimate these. The calculator gives you the decimal: √3 ≈ 1.732, √5 ≈ 2.236. For perfect squares (√16, √25, √144), do not reach for the calculator.
Numeric Entry with a decimal result. When you have done the setup work and arrive at a decimal answer that you need to enter into the box, use the calculator to confirm the computation and then Transfer Display.
Confirming an answer when time allows. If you solved a problem mentally and have a few seconds, a quick calculator check on the final arithmetic is a reasonable use of time.
When Mental Math Is Faster
The trap most test-takers fall into is reaching for the calculator by reflex, even when mental math would be faster. This adds up across 27 questions and can cost you several minutes over a full section.
Simple fractions and percents. What is 2/5 of 80? That is 32. Typing 2 ÷ 5 × 80 into the calculator, waiting for the result, and reading it back takes longer than thinking it through. Twenty percent of 150 is 30. These are mental math problems.
Single-digit or double-digit multiplication. 7 × 8 is 56. 12 × 15 is 180. Do not use the calculator for this.
Algebraic simplification before calculating. If a problem can be solved by canceling terms, factoring, or simplifying a ratio, do that first. A calculator cannot simplify algebra. Work the algebra down to a point where the remaining calculation is trivial, then compute.
Estimation on Quantitative Comparison. Many QC questions do not require an exact answer. You are comparing two quantities, not computing a precise value. If Quantity A is clearly larger or clearly smaller, you do not need the exact number. Estimation is faster and sufficient.
Problems involving special numbers. If a problem involves perfect squares, common Pythagorean triples (3-4-5, 5-12-13), or standard fractions (1/2, 1/3, 1/4, 1/5), you should know the results from memory. The GRE frequently uses these numbers precisely because they come out cleanly.
The Over-Reliance Problem
This is the most common calculator-related mistake in GRE Quant preparation.
Test-takers who use the calculator for every computation do not develop number sense. Number sense is the ability to look at a problem and immediately sense whether the answer should be large or small, positive or negative, a whole number or a decimal. It is what catches errors before you submit an answer.
When you calculate 3% of 600 and the calculator says 1800, number sense tells you that is wrong before you even check your work. You knew the answer should be small. If you are outsourcing all arithmetic to the machine, you lose that check.
The second problem is speed. Test-takers who rely heavily on the calculator are almost always slower than test-takers who calculate mentally when possible. Moving your hand to the calculator, typing in the values, reading the result, and returning to the problem adds 5-10 seconds per calculation. Across 27 questions where many involve multiple calculations, this is not negligible.
The practical solution: build your mental arithmetic in practice. When you practice Quant problems, make yourself do simple computations without the calculator. Only reach for it when the numbers genuinely warrant it. You will be faster on test day and more confident in your results.
Calculator Strategy by Question Type
Quantitative Comparison: Rarely use it. QC favors simplification and comparison, not exact calculation. If you are calculating an exact number to compare against another exact number on a QC problem, check whether you can simplify first.
Multiple Choice, Single Answer: Use it selectively. Reserve it for messy final calculations after the algebraic setup is done. If answer choices are round numbers, estimation is often sufficient.
Multiple Choice, Multiple Answer: Same as single answer MC. The calculator does not help you figure out which answer choices are correct. It only helps with the arithmetic once you know what to compute.
Numeric Entry: The most legitimate calculator use case. You have no answer choices to back-check against. The exact value matters. Use the calculator for the final computation and Transfer Display to enter the answer.
Data Interpretation: Moderate use. Percent calculations on DI problems sometimes involve ugly numbers pulled from charts. The calculator handles these cleanly. But reading the chart correctly matters more than the arithmetic. Get the right numbers from the visual first.
Practice With It Before Test Day
The GRE calculator interface is not identical to a physical calculator or your phone. There is a learning curve to using it efficiently. The positioning on screen, the Transfer Display button, the memory functions: these are things you want to be automatic by test day, not things you are figuring out during a section.
Use practice problems with the on-screen calculator open from day one. Practice the decision of when to use it and when not to. By the time you sit for your actual test, reaching for the calculator should feel like a deliberate tactical choice, not a reflex.
The calculator is an asset when used correctly. Used reflexively on every problem, it is a liability.